FileResponse: Pre-build range regex and re-use it for performance benefits

flaska.mjs

@@ -290,6 +290,8 @@ export class HttpError extends Error {
   }
 }
 
+const RangeRegexTester = /bytes=(\d+)-(\d+)?/
+
 export class FileResponse {
   constructor(filepath, stat) {
     this.filepath = filepath
@@ -333,7 +335,8 @@ export class FileResponse {
     let size = this.stat.size
 
     if (ctx.req.headers['range']) {
-      let match = ctx.req.headers['range'].match(/bytes=(\d+)-(\d+)?/)
+      let match = RangeRegexTester.exec(ctx.req.headers['range'])
+
       let ifRange = ctx.req.headers['if-range']
       if (ifRange) {
         if (ifRange[0] === '"' && ifRange !== etag) {
@@ -345,6 +348,7 @@ export class FileResponse {
           }
         }
       }
+
       if (match) {
         let start = Number(match[1])
         let end = size - 1

package.json

@@ -1,6 +1,6 @@
 {
   "name": "flaska",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "description": "Flaska is a micro web-framework for node. It is designed to be fast, simple and lightweight, and is distributed as a single file module with no dependencies.",
   "main": "flaska.mjs",
   "scripts": {